forms.py
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# -*- coding: utf-8 -*-
from django import forms
from django.utils.encoding import force_unicode
def hidden_id(id):
return forms.CharField(initial=id, widget=forms.HiddenInput())
# http://www.djangosnippets.org/snippets/863/ z moimi zmianami
class ChoiceWithOtherRenderer(forms.RadioSelect.renderer):
"""RadioFieldRenderer that renders its last choice with a placeholder."""
def __init__(self, *args, **kwargs):
super(ChoiceWithOtherRenderer, self).__init__(*args, **kwargs)
self.choices, self.other = self.choices[:-1], self.choices[-1]
def __iter__(self):
for input in super(ChoiceWithOtherRenderer, self).__iter__():
yield input
id = '%s_%s' % (
self.attrs['id'], self.other[0]) if 'id' in self.attrs else ''
label_for = ' for="%s"' % id if id else ''
checked = '' if not force_unicode(
self.other[0]) == self.value else 'checked="true" '
yield '<label%s><input type="radio" id="%s" value="%s" name="%s" %s/> %s</label> %%s' % (
label_for, id, self.other[0], self.name, checked, self.other[1])
class ChoiceWithOtherWidget(forms.MultiWidget):
"""MultiWidget for use with ChoiceWithOtherField."""
def __init__(self, choices):
widgets = [
forms.RadioSelect(choices=choices,
renderer=ChoiceWithOtherRenderer),
forms.TextInput
]
super(ChoiceWithOtherWidget, self).__init__(widgets)
def decompress(self, value):
if not value:
return [None, None]
return value
def format_output(self, rendered_widgets):
"""Format the output by substituting the "other" choice into the first widget."""
return rendered_widgets[0] % rendered_widgets[1]
class ChoiceWithOtherField(forms.MultiValueField):
"""
ChoiceField with an option for a user-submitted "other" value.
"""
def __init__(self, *args, **kwargs):
fields = [
forms.ChoiceField(
widget=forms.RadioSelect(renderer=ChoiceWithOtherRenderer),
*args, **kwargs),
forms.CharField(required=False)
]
widget = ChoiceWithOtherWidget(choices=kwargs['choices'])
kwargs.pop('choices')
self._was_required = kwargs.pop('required', True)
kwargs['required'] = False
super(ChoiceWithOtherField, self).__init__(widget=widget, fields=fields,
*args, **kwargs)
def compress(self, value):
if self._was_required and (not value or value[0] in (None, '')):
raise forms.ValidationError(self.error_messages['required'])
if not value:
return [None, u'']
return (value[0], value[1]
if force_unicode(value[0]) == force_unicode(
self.fields[0].choices[-1][0])
else self.fields[0].choices[int(value[0]) - 1][1])